Perman 2400DPI 2.4GHz Wireless 4 Button Optical Mouse Mice with USB Receiver for PC Laptop Blue Material: Plastic. Interface: USB. Mini adapter Plug and play. With 4 Keys. 2400DPI. Up to 10 meters of operating distance. Portable and weight light, very convenient to carry and store. Mouse type: Wireless Optical Mouse. Power Supply: 2x AAA Battery(Not included). Auto sleep. Wireless transmission, the longest sensing distance up to 10 meters.